基于(火积)耗散理论的新翼型换热器优化方法研究  

Optimization method of a novel airfoil fin heat exchanger based on the entransy dissipation theory

作　　者：韩增孝 郭江峰[1,2,3] 淮秀兰 HAN ZengXiao;GUO JiangFeng;HUAI XiuLan(Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;School of Engineering Science,University of Chinese Academy of Sciences,Beijing 100049,China;Nanjing Institute of Future Energy System,Nanjing 211135,China)

机构地区：[1]中国科学院工程热物理研究所,北京100190 [2]中国科学院大学工程科学学院,北京100049 [3]中科南京未来能源系统研究院,南京211135

出　　处：《中国科学：技术科学》2021年第10期1219-1230,共12页Scientia Sinica(Technologica)

基　　金：国家重点研发计划(编号:2017YFB0601803);国家能源集团重大先导项目(编号:GJNY2030XDXM-19-10)资助。

摘　　要：基于(火积)的分布匹配以协同强化的思路对新翼型换热器进行结构优化,提出两种不均匀的翅片分布结构,在给定热流边界条件下以超临界CO2为工质,对多种翼形肋分布结构进行传热流动性能的数值研究.结果表明,针对超临界流体物性剧烈变化导致的换热参数分布极不均匀的特点,在总换热面积不变的条件下通过相应改变新翼型肋片分布方式,改善了流体(火积)与壁面热流(火积)的分布匹配性,进而改善了流道内局部(火积)耗散率的分布均匀性,使流道内总(火积)耗散率减小,换热性能提高.比拟两流体耦合换热过程中变热流边界条件下的数值研究表明,在换热器两流体耦合换热中依据换热参数分布特性相应改变新翼型肋的分布方式,在总换热面积不变的条件下同样改善冷热流体(火积)的分布匹配性,进而使局部(火积)耗散率沿换热区域分布更为均匀,减小总的(火积)耗散率.(火积)的分布匹配原则为换热器结构优化和改进提供了新的思路和方法,具有重要的理论和工程意义.The structure of the novel airfoil fin heat exchanger was optimized by the synergistic enhancement method based on the entransy matching performance, and two types of nonuniform fin distribution structures were proposed. The heat transfer and flow performance of various airfoil fin distribution structures were numerically studied by using supercritical CO;as the working medium under constant heat flux boundary conditions. The results showed that considering the extremely uneven distribution of heat transfer parameters arising from the drastic changes in the physical properties of supercritical fluid, the distribution of novel airfoil fins was changed under the condition that the total heat transfer area remained constant. The matching performance between the entransy of fluid and that of the wall heat flux was improved, and the distribution uniformity of the local entransy dissipation rate in the channel was improved. Hence, the total entransy dissipation rate in the channel was reduced, and the heat transfer performance was improved.The numerical studies under the boundary condition of variable heat flux in the two-fluid coupled heat transfer process showed that the distribution mode of the novel airfoil fins changed according to the distribution characteristics of heat transfer parameters in the two-fluid coupled heat exchanger. Under the condition that the total heat transfer area remained constant, the distribution matching of the entransy of hot and cold fluid also improved, so that the local entransy dissipation rate was more uniform in the heat transfer area,and the entransy dissipation rate was reduced. The entransy distribution-matching principle provides a new idea and method for the structural optimization and improvement of heat exchangers, which has important theoretical and engineering significance.

关 键 词：(火积)耗散 分布匹配 印刷电路板换热器(PCHE) 超临界流体 传热强化 

分 类 号：TK172[动力工程及工程热物理—热能工程]